Remove matrix-auth v0 and fix tests #2405

Job	Run time
integration-tests / Plan	4s
integration-tests / Build charm (synapse)	10m 59s
integration-tests / Build rock (synapse)	24m 39s
integration-tests / Plan Image Scanning	5s
integration-tests / Integration tests / Integration tests (test_charm)	28m 44s
integration-tests / Integration tests / Integration tests (test_nginx)	11m 31s
integration-tests / Integration tests / Integration tests (test_s3)	24m 27s
integration-tests / Integration tests / Integration tests (test_scaling)	19m 24s
integration-tests / Integration tests / Integration tests (test_matrix_auth)	14m 37s
integration-tests / Scan Image (ghcr.io-canonical-synapse-3d0473b52916880985c2d21ca8ac74873ab378d5-_3.0_amd64.tar)	1m 44s
integration-tests / Required Integration Test Status Checks	1s
allure-report	0s
	2h 16m 15s

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